<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>地狗购物网——网页定位导航效果</title>
<style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            font-size: 12px;
            line-height: 1.7;
        }

        li {
            list-style: none;
        }

        #content {
            width: 800px;
            margin: 0 auto;
            padding: 20px;
        }

        #content h1 {
            color: #0088bb;
        }

        #content .item {
            padding: 20px;
            margin-bottom: 20px;
            border: 1px dotted #0088bb;
        }

        #content .item h2 {
            font-size: 16px;
            font-weight: bold;
            border-bottom: 2px solid #0088bb;
            margin-bottom: 10px;
        }

        #content .item li {
            display: inline;
            margin-right: 10px;
        }

        #content .item li a img {
            width: 230px;
            height: 230px;
            border: none;
        }

       
/*请补充此处代码，让导航菜单在右侧绝对定位显示*/


        }

        #menu ul li a {
            display: block;
            margin: 5px 0;
            font-size: 14px;
            font-weight: bold;
            color: #333;
            width: 80px;
            height: 50px;
            line-height: 50px;
            text-decoration: none;
            text-align: center;
        }

        #menu ul li a:hover,
        #menu ul li a.current {
            color: #fff;
            background: #0088bb;
        }

        /*ie6 hack*/
        * html, * html body {
            background-image: url(about:blank);
            background-attachment: fixed;
        }

         #menu {
            position: fixed;
            /*position: absolute;*/
            top: 100px;
            left:50%;
            margin-left: 400px;
        }
        #menu a{
            font-size: 20px;
            line-height: 50px;
            color:blue;
            text-decoration: none;
        }

</style>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.js"></script>
<script>
        $(document).ready(function(){
            $(window).scroll(function(){
                var top=$(document).scrollTop();
                var menu=$("#menu");
                var currentId="";
                var items=$("#content").find(".item");
                items.each(function(){
                    var m=$(this);
                    var itemtop=m.offset().top;
                    if(top>itemtop-200){
                     currentId="#"+m.attr("id");
                    }else{
                        return false;
                    }
                });
                var currentlink=$("#menu").find(".current");
                if(currentId && currentlink.attr("href")!=currentId){
                    currentlink.removeClass("current");
                    $("#menu").find("[href="+currentId+"]").addClass("current");
                }
            });
        });
</script>
</head>
<body>
<div id="menu">
<ul>
<!--运用锚点，实现导航定位。-->


<li><a href="#item1" class="current">1F 男装</a></li>
<li><a href="#item2">2F 女装</a></li>
<li><a href="#item3">3F 美妆</a></li>
<li><a href="#item4">4F 数码</a></li>
<li><a href="#item5">5F 母婴</a></li>
</ul>
</div>
<div id="content">
<h1>地狗购物网</h1>

<div id="item1" class="item">
<h2>1F 男装</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/53660fce0001111903990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item2" class="item">
<h2>2F 女装</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/5366104c0001e5c403990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item3" class="item">
<h2>3F 美妆</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610820001cf5b03990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item4" class="item">
<h2>4F 数码</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610ac00012df703990422.jpg" alt=""/></a></li>
</ul>
</div>
<div id="item5" class="item">
<h2>5F 母婴</h2>
<ul>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
<li><a href="#"><img src="http://img.mukewang.com/536610cd0001f34603990422.jpg" alt=""/></a></li>
</ul>
</div>
</div>
</body>
</html>